Among the companies with shares expected to actively trade in Friday's session are Google Inc. (GOOG), Microsoft Corp. (MSFT) and Community Health Systems Inc. (CYH).

Google's profit and sales continued to climb in the recent quarter, but deceleration in the growth of its main business of selling search advertising reignited concerns about the impact of mobile devices and the Web giant's push into lower-margin businesses. The results were lower than what Wall Street was expecting, sending shares down 2.9% to $883.99 premarket.

Microsoft took a $900 million charge related to slashing the price of its struggling Surface tablet computer, highlighting the company's struggle to fit into the new tech world dominated by mobile devices. The software giant revealed the charge with its fourth-quarter report, which fell below Wall Street expectations and sent Microsoft shares sharply lower, down 7.7% to $32.71 premarket.

Hospital operator Community Health slashed its second-quarter earnings forecast and said it was served with an additional subpoena from the government as part of an investigation into Medicare admissions. The double dose of bad news sent shares of Community Health and its peers sharply lower in premarket trading. Community Health shares slumped 15% to $40.32. Also sliding were shares of Health Management Associates Inc. (HMA), which fell 6.7% to $15.25, and Tenet Healthcare Corp. (THC), which dropped 3.6% to $42.15.

Charter Communications Inc. (CHTR) is said to be working with Goldman Sachs Group Inc. (GS) to pursue a bid for Time Warner Cable Inc. (TWC), according to a Bloomberg report that cites people with knowledge of the situation. Representatives for all three companies declined to comment to Bloomberg. Time Warner shares rose 5.3% to $119.99 premarket.

Acacia Research Corp. (ACTG) reported a second-quarter loss as legal fees and other costs cut into the company's revenue from patents. Shares, trading in which was briefly halted on the news, dropped 14% premarket to $21.25.

Advanced Micro Devices Inc. (AMD) swung to a second-quarter loss as the chip maker continued to suffer sales declines on lower demand for personal computers. Shares fell 11% premarket to $4.13.

Intuitive Surgical Inc. (ISRG) slashed its forecast for sales growth this year as the company deals with increasing concerns about its da Vinci surgical robot systems. Shares of the Sunnyvale, Calif., company fell 10% to $378.16 premarket as Intuitive Surgical disclosed a number of issues that have derailed growth in the use of its robots to perform hysterectomies, a primary catalyst for sales of the company's systems and surgical instruments.

Oxigene Inc. (OXGN) said the European Medicines Agency has granted orphan drug status to its ovarian cancer treatment Zybrestat. The biopharmaceutical company's shares soared 28% to $3.20 premarket.

Specialty-pharmaceutical firm pSivida Corp. (PSDV, PVA.AU) said it intends to offer shares, but didn't name a time or an amount. PSivida develops drugs to treat diseases in the back of the eye. Shares were off 4.4% premarket to $3.27.

Skyworks Solutions Inc.'s (SWKS) fiscal third-quarter earnings rose 33% as the wireless-chip supplier continued to see strong demand across a range of end markets. Shares jumped 5.9% to $23.78 premarket as results exceeded the company's estimates and as it provided upbeat guidance for the current quarter.

Chipotle Mexican Grill Inc.'s (CMG) second-quarter profit grew 7.6% as the burrito chain reported a jump in sales tied to increased customer traffic and an extra day in the quarter. Shares rose 4.9% to $395.30 in premarket trading as results topped Wall Street estimates.

 
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Align Technology Inc.'s (ALGN) second-quarter earnings rose 2.9% as the maker of Invisalign braces posted increased revenue on higher shipments. The company's results beat estimates.

Apache Corp. (APA) has agreed to sell its Gulf of Mexico shelf operations and properties to Fieldwood Energy LLC for $3.75 billion in cash, as the U.S. oil-and-gas company looks to pay down debt.

Capital One Financial Corp.'s (COF) second-quarter profit soared from a year earlier as the credit-card lender's provision for credit losses fell and revenue increased slightly. The lender's results topped analyst expectations.

Cepheid's (CPHD) swung to second-quarter loss as the maker of molecular tests for the health-care industry was hurt by higher operating costs and weaker margins that masked revenue growth.

Cubist Pharmaceuticals Inc.'s (CBST) second-quarter earnings fell 65% as the biopharmaceutical company was hurt by higher costs that more than offset double-digit revenue growth.

Cytec Industries Inc.'s (CYT) second-quarter profit slid 15% as the specialty-chemicals and materials company recorded a loss tied to the sale of a coating-resins business it sold earlier this year.

Medical products maker Hologic Inc. (HOLX) said Robert Cascella has stepped down as chief executive for personal reasons, and the company has brought back Jack W. Cumming.

ICU Medical Inc.'s (ICUI) second-quarter earnings fell 19% as the medical-products maker recorded lower sales from its critical-care business. The company also lowered its full-year outlook.

Reinsurance Group of America Inc. (RGA) swung to a steep second-quarter loss, as the life reinsurer recorded a $184 million after-tax charge related to increased claim liabilities in Australia.

Synovus Financial Corp. (SNV) plans to sell $185 million of its stock as part of its plan to repay about $968 million it had received under the U.S. Treasury's Troubled Asset Relief Program during the financial crisis.

Stryker Corp.'s (SYK) second-quarter profit fell 34% as the medical-device maker recorded a $170 million charge tied to product recalls, though sales grew.

TransMontaigne Partners L.P. (TLP) is launching an offering of 1.45 million shares, as it looks to repay debt and fund its share of the construction of the Battleground Oil terminal project, its joint venture with Kinder Morgan Energy Partners L.P. (KMP). TransMontaigne had around 14.4 million shares outstanding as of April 30.

Write to Anna Prior at anna.prior@dowjones.com

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